EP1934644A1 - F/theta-objektiv und scannervorrichtung damit - Google Patents
F/theta-objektiv und scannervorrichtung damitInfo
- Publication number
- EP1934644A1 EP1934644A1 EP06806048A EP06806048A EP1934644A1 EP 1934644 A1 EP1934644 A1 EP 1934644A1 EP 06806048 A EP06806048 A EP 06806048A EP 06806048 A EP06806048 A EP 06806048A EP 1934644 A1 EP1934644 A1 EP 1934644A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lens
- theta
- lenses
- scanner
- beam path
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000012937 correction Methods 0.000 claims description 14
- 230000005499 meniscus Effects 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 230000005855 radiation Effects 0.000 claims description 7
- 239000011521 glass Substances 0.000 abstract description 4
- 230000001681 protective effect Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 9
- 230000003287 optical effect Effects 0.000 description 8
- 230000004075 alteration Effects 0.000 description 7
- 201000009310 astigmatism Diseases 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 239000006117 anti-reflective coating Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/50—Optics for phase object visualisation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/0005—Optical objectives specially designed for the purposes specified below having F-Theta characteristic
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/101—Scanning systems with both horizontal and vertical deflecting means, e.g. raster or XY scanners
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/105—Scanning systems with one or more pivoting mirrors or galvano-mirrors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
- B23K26/0643—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising mirrors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
- B23K26/0648—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising lenses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/082—Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head
Definitions
- the invention relates to a F / theta lens for forming a flat image field and a scanner device with such a lens.
- F / theta lens In material processing with high-power lasers, scanner devices are increasingly being used for fast positioning of the laser beam. If the beam deflection takes place with scanner mirrors in the (approximately) collimated beam, a so-called F / theta lens is used for focusing, which is characterized in particular by a large, planar image field. In the range up to about 1 kW average laser power such F / theta lenses are usually composed of about 6 spherical lenses from different, even high refractive glasses. These lenses are typically optimized for marking applications, ie they have a very high (near diffraction limited) image quality but only a moderate power compatibility.
- the conventional F / theta lenses are either only conditionally or not at all used for material processing, since strong losses in the focusability of the radiation and damage due to overheating of the lenses occur.
- beam guiding systems with beam deflection in the focused beam are used in scanner devices, in which the requirements for the objective are lower.
- the usable working distance is considerably reduced by the scanner mirrors.
- the image field in this case is strongly spherically curved, which is usually compensated by a z adjustment of the objective.
- the required scanner levels are very large, which limits their dynamics.
- US Pat. No. 6,396,616 B1 discloses a laser imaging system which has a scanner mirror and an F / theta objective with a spherical, an aspheric and a toric lens which acts as a reducing lens to increase the optical beam power.
- the lens has at least two, preferably exactly two in the beam path arranged behind one another lenses that are resistant to a laser radiation power of more than 1 kW, where at least one lens is one of two asp ⁇ a ⁇ sc ⁇ e Li ⁇ se ⁇ ac ⁇ e ⁇ auiweisi.
- a high-performance F / theta objective is achieved by reducing the number of lenses used to the minimum required for the application (preferably exactly two).
- at least one aspherical lens surface is used.
- aspherical lens surfaces have additional degrees of freedom which can be used to compensate, in particular, aberrations of a higher order, which are particularly significant with large scanning angles.
- a complete flattening of the image field is dispensed with; Instead, a so-called. Flattening is performed on average, ie it remains a dependent of the deflection angle astigmatism in the focused beam.
- At least one, preferably all lenses are made of synthetic quartz glass.
- the selection of the optical materials for the lenses takes place in particular under the aspects of low absorption, low thermo-optical effects and high load capacity.
- the preferred material for the UV / VIS / NIR range (about 170 nm - 3 ⁇ m) is synthetic quartz glass.
- a disadvantage is the low refractive index (n ⁇ 1, 45) of quartz glass, which - compared to high-refractive optical glasses (n ⁇ 1, 65 - 1, 85), as used in conventional F / theta lenses - to more curved Surfaces and thus iA leads to higher aberrations and increased losses of the antireflective coatings.
- quartz glass e.g., quartz glass
- the dispersion of quartz glass in the VIS and NIR range is sufficiently low that the e.g. to remain within acceptable limits in coaxial observation through the lens.
- other optical materials e.g, YAG or sapphire
- YAG or sapphire may also be used as the lens material.
- the first lens in the beam path is a preferably spherical meniscus lens.
- the meniscus lens is preferably as strong as possible on the object side, ie, approximately hemispherical, concavely curved, In order to make it possible to use thin lenses, it is possible to obtain a rating of ⁇ bi ⁇ e ⁇ es (on average) by beam widening.
- the second side of the meniscus lens is preferably approximately concentric with the first, so that the overall result is a low (negative) refractive power.
- the second lens in the beam path is a focusing lens with an aspherical lens surface.
- the aspherical focusing lens can be designed as a plano-convex lens, a meniscus lens or a biconvex lens, and effects focusing of the beam as well as minimization of spherical aberration, astigmatism and higher order errors.
- the refractive power of the focusing lens also determines the focal length of the lens.
- a wavefront correction optical system is arranged in the beam path in front of the F / theta objective.
- the wavefront correction optics has a collimating lens with one or two aspherical lens surfaces.
- a spherical collimating lens is provided in the scanner apparatus for collimating the divergent beam exiting an optical fiber.
- the aspherical collimating lens replaces this conventional collimating lens, which is supposed to produce only the best possible parallel beam.
- this lens also takes on a fine correction of the wave fronts, which in conjunction with the two lenses of the F / theta lens has a better image quality on average over the scan area It is possible that such a collimating lens would be a part of the correction of the spherical aberrations.
- the wavefront correction optics has a phase correction plate, which serves for wave front correction. This can e.g. combined with a conventional, spherical collimating lens.
- FIG. 1 shows a longitudinal section through an embodiment of the inventive F / theta lens.
- FIG. 2 shows a longitudinal section through an embodiment of the scanner device according to the invention with the F / theta lens of FIG. 1.
- the F / theta lens 1 shown in FIG. 1 includes a meniscus lens 2 and a focusing lens 3 mounted in a lens frame 4 disposed in a lens housing 5.
- the meniscus lens 2 has on the object side an approximately hemispherical concave curved first lens surface 6 in order to allow for the smallest possible lens thickness a flattening of the image field (on average) by beam expansion.
- the second, image-side lens surface 7 of the meniscus lens 2 is approximately concentric with the first lens surface 6, so that the overall result is a low (negative) refractive power.
- the focusing lens 3 effects the focusing of a laser beam (not shown pictorially in FIG. 1) with minimization of spherical aberration, astigmatism and errors of a higher magnification in the case of a spherical lens 3.
- FIG Order by utilizing additional degrees of freedom, which are caused by the aspherical lens surface 8.
- the F / theta lens 1 further comprises a holder 10 mounted on the image side for a protective glass 11, which can be snapped onto the housing 5 of the lens 1, as described in more detail in the registered utility model DE 20 2004 019 487.2 of the Applicant.
- the meniscus lens 2 and the focusing lens 3 are made of anhydrous, synthetic quartz glass, whereby a very low absorption of the laser radiation and a low thermal expansion of the lens system while increasing the power tolerance of the lens 1 is at least 4-6 kW achieved. Furthermore, the design shown can achieve large weight and size savings over a conventional F / theta lens with a typically larger number of lenses. Due to the minimized
- Fig. 2 shows the F / theta lens 1 in the installed state in a scanner device 12 for material processing.
- This has an optical fiber 13, from which a divergent laser beam 14a with high beam power (> 1kW) emerges, which runs in the vertical direction through the scanner device 12 and is transformed by means of a collimating lens 15 in a further vertically extending, collimated laser beam 14b.
- the collimating lens 15 has a specially optimized aspherical lens surface.
- ⁇ i ⁇ i ⁇ o ⁇ mat ⁇ ons ⁇ better scan quality is possible over the scan area than with a conventional scan
- collimating lens would be possible.
- the aspherical collimating lens 15 may also be replaced by a combination of a spherical collimating lens and a phase correction plate (not shown).
- the collimated laser beam 14 b is deflected at a deflection mirror 16 by 90 ° from the vertical direction in the horizontal direction and enters via an entrance aperture in the scan head 17 a.
- the collimated laser beam 14b first strikes a planar X-scanner mirror 18, which deflects the beam in the X-direction onto a planar Y-scanner mirror 19 which further deflects the beam in the Y-direction.
- the X-scanner mirror 18 and the Y-scanner mirror 19 are attached to galvanometers and can be rotated. The position of the axis of rotation of the galvanometer determines the deflection angle of the respective scanner mirror 18, 19 and thus the position of the laser beam in the (not shown) image field.
- the collimated laser beam 14b exits the scan head 17 through an exit port provided with the F-theta objective 1 of FIG.
- This causes by means of the meniscus lens 2 an expansion of the laser beam 14b to produce the largest possible image field, and by means of the following focusing lens 3, the conversion of the expanded laser beam into a convergent laser beam 14c, which is focused in a focal point, around which by the lens assembly in F / theta lens 1 is generated in the middle flat image field.
- the optical system present in the scanner device 12 is not completely corrected ("diffraction-limited"), the goal is to keep the aberrations at all deflections of the scanner mirrors 18, 19 within tolerable limits. In this case, it is accepted that at low deflections of the same deterioration of the image occurs in comparison to a system of spherical lenses.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
- Mechanical Optical Scanning Systems (AREA)
- Lens Barrels (AREA)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE202005015719U DE202005015719U1 (de) | 2005-10-07 | 2005-10-07 | F/theta-Objektiv und Scannervorrichtung damit |
| PCT/EP2006/009636 WO2007042198A1 (de) | 2005-10-07 | 2006-10-05 | F/theta-objektiv und scannervorrichtung damit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1934644A1 true EP1934644A1 (de) | 2008-06-25 |
| EP1934644B1 EP1934644B1 (de) | 2011-07-13 |
Family
ID=35502379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP06806048A Active EP1934644B1 (de) | 2005-10-07 | 2006-10-05 | Scannervorrichtung mit f/theta-objektiv |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US8102581B2 (de) |
| EP (1) | EP1934644B1 (de) |
| JP (1) | JP4681651B2 (de) |
| CN (1) | CN101438195B (de) |
| AT (1) | ATE516516T1 (de) |
| DE (1) | DE202005015719U1 (de) |
| WO (1) | WO2007042198A1 (de) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007011902A1 (de) | 2007-03-13 | 2008-07-24 | Daimler Ag | Laserschweißvorrichtung |
| DE102008029946A1 (de) | 2008-06-26 | 2009-12-31 | Limo Patentverwaltung Gmbh & Co. Kg | Scannvorrichtung für einen Laserstrahl |
| CN104238071B (zh) * | 2013-06-24 | 2016-12-28 | 大族激光科技产业集团股份有限公司 | 一种F‑theta光学镜头及激光加工系统 |
| TW201704800A (zh) * | 2015-07-22 | 2017-02-01 | Showin Technology Co Ltd | 光學掃描模組及其光學掃描鏡頭 |
| CN105116554A (zh) * | 2015-09-08 | 2015-12-02 | 上海嘉强自动化技术有限公司 | 一种高效型连续扩束聚焦系统 |
| KR101709566B1 (ko) * | 2016-06-01 | 2017-03-07 | (주)한빛레이저 | 펄스 레이저를 이용한 각인 장치 |
| DE102017209325B4 (de) * | 2016-06-30 | 2021-11-04 | Jenoptik Optical Systems Gmbh | F-Theta-Objektiv mit zumindest einer ersten und einer zweiten optischen Baugruppe und eine Anordnung zur Lasermaterialbearbeitung mit einem F-Theta-Objektiv |
| DE102016211811B4 (de) | 2016-06-30 | 2022-02-24 | Trumpf Laser Gmbh | F-Theta-Objektiv und Scannervorrichtung damit |
| KR102603393B1 (ko) | 2016-12-06 | 2023-11-17 | 삼성디스플레이 주식회사 | 레이저 가공 장치 |
| DE202017105001U1 (de) * | 2017-08-21 | 2017-09-14 | Jenoptik Advanced Systems Gmbh | LIDAR-Scanner mit MEMS-Spiegel und wenigstens zwei Scanwinkelbereichen |
| EP3693767A1 (de) * | 2019-02-05 | 2020-08-12 | Fisba AG | Vorrichtung zur lichtemission |
| CN110045498B (zh) * | 2019-04-01 | 2025-10-28 | 深圳市速腾聚创科技有限公司 | 光扫描装置和激光雷达 |
| JP7332149B2 (ja) * | 2019-09-27 | 2023-08-23 | 株式会社トヨコー | レーザ照射装置 |
| DE102020202549B4 (de) * | 2020-02-28 | 2022-05-05 | Trumpf Laser Gmbh | Optische Anordnung mit einem F-Theta-Objektiv |
| US11945043B2 (en) * | 2020-11-20 | 2024-04-02 | Concept Laser Gmbh | Energy beam generation systems and optical systems with expanded scan fields |
| KR102578688B1 (ko) * | 2023-04-20 | 2023-09-14 | 제놉스 주식회사 | 보호 윈도우 교체 시기 모니터링 기능이 구비된 에프세타 렌즈 모듈 |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5736709A (en) * | 1996-08-12 | 1998-04-07 | Armco Inc. | Descaling metal with a laser having a very short pulse width and high average power |
| CN2284378Y (zh) * | 1996-11-11 | 1998-06-17 | 华中理工大学 | 大轴弯曲光电测量仪 |
| JP4208209B2 (ja) * | 1998-06-22 | 2009-01-14 | フジノン株式会社 | コリメータレンズおよびこれを用いた光走査装置 |
| JP3346374B2 (ja) * | 1999-06-23 | 2002-11-18 | 住友電気工業株式会社 | レーザ穴開け加工装置 |
| JP3201394B2 (ja) | 1999-08-10 | 2001-08-20 | 住友電気工業株式会社 | fθレンズ |
| US6396616B1 (en) * | 2000-10-10 | 2002-05-28 | 3M Innovative Properties Company | Direct laser imaging system |
| KR100461300B1 (ko) | 2002-10-21 | 2004-12-16 | 삼성전자주식회사 | 온도보정된 콜리메이팅 렌즈 및 이를 이용한 광주사장치 |
| CN2585256Y (zh) * | 2002-12-18 | 2003-11-05 | 上海市激光技术研究所 | 二个孔径光阑置于前端的fθ物镜 |
| CN1438510A (zh) * | 2003-01-08 | 2003-08-27 | 王青山 | 一种分区多行扫描式激光投影机 |
| CN1299409C (zh) * | 2005-03-02 | 2007-02-07 | 中国科学院上海光学精密机械研究所 | 具有单模光纤耦合及空间滤波器的激光二极管 |
-
2005
- 2005-10-07 DE DE202005015719U patent/DE202005015719U1/de not_active Expired - Lifetime
-
2006
- 2006-10-05 EP EP06806048A patent/EP1934644B1/de active Active
- 2006-10-05 JP JP2008533935A patent/JP4681651B2/ja active Active
- 2006-10-05 AT AT06806048T patent/ATE516516T1/de active
- 2006-10-05 CN CN2006800459764A patent/CN101438195B/zh active Active
- 2006-10-05 WO PCT/EP2006/009636 patent/WO2007042198A1/de not_active Ceased
-
2008
- 2008-04-07 US US12/098,918 patent/US8102581B2/en active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2007042198A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4681651B2 (ja) | 2011-05-11 |
| DE202005015719U1 (de) | 2005-12-08 |
| JP2009510535A (ja) | 2009-03-12 |
| US20080259427A1 (en) | 2008-10-23 |
| CN101438195A (zh) | 2009-05-20 |
| WO2007042198A1 (de) | 2007-04-19 |
| ATE516516T1 (de) | 2011-07-15 |
| CN101438195B (zh) | 2012-06-13 |
| US8102581B2 (en) | 2012-01-24 |
| EP1934644B1 (de) | 2011-07-13 |
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